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  1. Galleries
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  4. » My setup for solar photos in H-alpha

 
My setup for solar photos in H-alpha...

Sole in H alpha

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My setup for solar photos in H-alpha sent on April 06, 2022 (9:18) by Daniele Bonfiglio. 12 comments, 958 views. [retina]

1/500 f/2.2, ISO 125, hand held. Montagnana, Italy.

Ecco il mio setup per le foto solari in H-alpha. Si tratta di una mirrorless Fujifilm X-T30 al fuoco diretto di telescopio solare Daystar Solar Scout 60/930 DS, il tutto su una montatura motorizzata Skywatcher AZ-GTi. Nell'immagine si vede il disco solare mostrato in live view sul display delle fotocamera. Il colore rossastro del disco solare è dato dal fatto che il telescopio solare ha uno speciale filtro interferenziale che seleziona solo la lunghezza d'onda H-alpha di 656,281 nm (quindi proprio nel rosso) che è la lunghezza d'onda principale in cui emettono gli atomi di idrogeno del plasma parzialmente ionizzato che compone la cromosfera solare. La cromosfera è il sottile strato (poche migliaia di km) più rarefatto che circonda la fotosfera (che è invece la regione da cui proviene la maggior parte della luce solare, con uno spettro continuo di corpo nero). Le foto in H-alpha permettono di vedere moltissimi fenomeni interessanti che si hanno sulla cromosfera, tra cui ad esempio protuberanze e brillamenti solari. Come si vede nella foto, il filtro interferenziale del telescopio (detto anche interferometro di Fabry-Perot o Fabry-Perot etalon) viene alimentato da un powerbank da cellulare. L'alimentazione serve a mantenere il cristallo di mica all'interno del filtro alla giusta temperatura per selezionare la lunghezza d'onda appropriata. C'è anche una manopolina per variare la lunghezza d'onda selezionata sia sintonizzarsi sulla giusta lunghezza d'onda (visto che il funzionamento del filtro varia un poco da esemplare ad esemplare) sia per eventualmente spostarsi su lunghezze d'onda vicine (le cosiddette blue and red wings della lunghezza d'onda principale).



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avatarsenior
sent on April 06, 2022 (19:22) | This comment has been automatically translated (show/hide original)

Bravo bravo bravo. excellent explanation

avatarsenior
sent on April 06, 2022 (21:57) | This comment has been translated

Very interesting!

avatarsenior
sent on April 07, 2022 (10:44) | This comment has been automatically translated (show/hide original)

Very very interesting.
I am absolutely not well versed in the subject, on the contrary, but it seems to me that technology has made great strides!
I have no idea of the costs of such equipment, but already the fact that it is also available to amateurs and that it provides (to those who are able to get them, of course. The technology alone, although necessary, is not enough! ) results like this... It's fantastic!

avatarjunior
sent on April 07, 2022 (11:24) | This comment has been automatically translated (show/hide original)

Thank you all! Yes, in fact technology has made great strides and above all has been simplified to allow you to use these tools even at an amateur level. My solar telescope is an "entry-level" version and despite this it costs 1000 euros :-D This price increases rapidly going to larger apertures, which really allow you to get details to take your breath away, as an example I propose this image made with a refractor I think 12 cm or maybe even more, which in my opinion is phenomenal pavelprokop.eu/wp-content/uploads/2022/03/2022-03-23-0933_5N.jpg
hello, Daniele

avatarsenior
sent on April 07, 2022 (11:42) | This comment has been automatically translated (show/hide original)

Well, obviously beyond the usable technology, congratulations for your works, which require I think a lot of effort in pre and post production!
Thanks for the explanations!

avatarjunior
sent on April 07, 2022 (12:07) | This comment has been automatically translated (show/hide original)

Hello Daniele, figured it's a pleasure, thank you very much to you too!

avatarjunior
sent on April 08, 2022 (14:10) | This comment has been automatically translated (show/hide original)

Daniele, x curiosity: refractors of that class as they are normally equipped to portray images of that magnitude?
I've heard about etalon filters, do they have anything to do with it?

avatarjunior
sent on April 08, 2022 (15:17) | This comment has been automatically translated (show/hide original)

Hello Serafino,
are you referring to refractors from 12 cm upwards? As far as I know, in that case you need an energy rejection filter (ERF) to put in front of the telescope. It should be a particular glass plate that reflects a good part of the light of the wavelength that does not interest. The commercial ones are produced by Badeer and cost a bang (the more you go up at the opening, the more they cost of course). The etalon filters should instead be the real interference filters to make the fine selection of the H-alpha wavelength (like the one I also have on my telescope) but those need that the intensity of the incoming light is not too much otherwise they heat up too much! (in the case instead of medium aperture telescopes let's say on 10 cm just instead an IR cut filter immediately upstream of the etalon filter (and you do not need an ERF in front of the telescope)
Hello, Daniele

avatarjunior
sent on April 08, 2022 (20:44) | This comment has been automatically translated (show/hide original)

thanks a lot x the clarifications, Daniele :-) very clear and exhaustive.

avatarjunior
sent on April 09, 2022 (9:25) | This comment has been automatically translated (show/hide original)

sorry if I take advantage again, Daniele :-)
looking on the net I dwelt on this setup
https://assets.baader-planetarium.com/media/wysiwyg/astrophysics-130_solarspectrum_telecentric_morpheus_M68.jpg
the Baader D-ERF Energy Rejection Filter (75 - 180mm) is the one you mentioned?
from what I've read it's a pre-filter, right?

avatarjunior
sent on April 12, 2022 (16:52) | This comment has been automatically translated (show/hide original)


avatarjunior
sent on April 15, 2022 (10:03) | This comment has been automatically translated (show/hide original)

thank you very much, very interesting ;-)


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